According to British newspaper, The Telegraph, we now also know that it will use the 3DS’ gyro-sensors in some manner and that there are currently no plans for the title to include StreetPass functionality. These details come straight from the horse’s mouth — that of Nintendo's Shigeru Miyamoto.
"Sometimes people ask why the 3DS isn’t double stick," Miyamoto said to reporters in the U.K., during a recent interview, providing some insight into the 3DS' hardware design. "One is normally used to control the camera, but having the gyro sensor you can replace the analogue stick by moving the console, which is very intuitive." He confirmed that Super Mario 3D will make use of the gyro sensor, but didn’t outright reveal how.
Miyamoto also stated that, "unless a spectacular idea comes to mind," Super Mario 3D won't use the 3DS' StreetPass features.